2.
Insert the necessary preposition
1. Electricity gets its name ... amber.
2. All matter is made ... of atoms.
3. Atoms themselves have a nucleus made ... neutrons and protons.
4. Some atoms are very attached ... their electrons and refuse to let them go.
5. In 1747, Benjamin Franklin received a Leyden jar from England and set ... doing some of his own experiments.
6. He soon concluded that electricity flowed because objects had different types ... electric charge.
7. Michael Faraday, another Englishman, then realised that if electricity could produce ... a magnetic field, then a magnetic field could produce ... electricity.
8. In 1831, he attached a copper plate to a steam engine which turned the plate ... and ... in a magnetic field.
9. A current ... electricity was generated and the electricity generator was born.
10. The next time you turn ... an electrical appliance, think about what the world would be like without electricity and give thanks to the frogs of the world for all their, unwilling, help.